Excuse me but real men use butterflies. You see the change in system state as the output is calculated creates temperature differences which in turn create pockets of higher pressure air to form near the computer. Such a small change in the distribution of heat near the earth's surface creates minute, immeasurable, changes in atmospheric circulation. Fortunately it also annoys butterflies which come around flapping their wings outside my window and I've learnt how to read the output from the number of butterflies and the individual and group flapping patterns. I even use the reverse technique to program on occasion but its faster to use a vi shortcut ->:dwit for do what I think. Emacs is useless and has no such feature but you can still use the butterflies.